11101111121221 has 32 divisors (see below), whose sum is σ = 12449023488000. Its totient is φ = 9812554495680.

The previous prime is 11101111121161. The next prime is 11101111121341. The reversal of 11101111121221 is 12212111110111.

It is a cyclic number.

It is not a de Polignac number, because 11101111121221 - 2¹⁷ = 11101110990149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11101111121195 and 11101111121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101111121921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117925630 + ... + 118019728.

It is an arithmetic number, because the mean of its divisors is an integer number (389031984000).

Almost surely, 2^{11101111121221} is an apocalyptic number.

11101111121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11101111121221 is a deficient number, since it is larger than the sum of its proper divisors (1347912366779).

11101111121221 is a wasteful number, since it uses less digits than its factorization.

11101111121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95649.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 11101111121221 its reverse (12212111110111), we get a palindrome (23313222231332).

The spelling of 11101111121221 in words is "eleven trillion, one hundred one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".